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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2355d23cb5ada77d7af9b9f8edd7b608255bc743758518bf6bd0e2cd6b466e' 
  AND token = '98MklhJL3ElP9LxkWWhOMuq2kqWnM0bumXr6Ez7xm9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}